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graphics.cpp

/* ScummVM - Scumm Interpreter
 * Copyright (C) 2001  Ludvig Strigeus
 * Copyright (C) 2001-2006 The ScummVM project
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.

 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.

 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 * $URL: https://svn.sourceforge.net/svnroot/scummvm/scummvm/tags/release-0-9-1/backends/sdl/graphics.cpp $
 * $Id: graphics.cpp 22913 2006-06-04 12:38:27Z eriktorbjorn $
 *
 */

#include "backends/sdl/sdl-common.h"
#include "common/util.h"
#include "graphics/font.h"
#include "graphics/fontman.h"
#include "graphics/scaler.h"
#include "graphics/surface.h"

static const OSystem::GraphicsMode s_supportedGraphicsModes[] = {
      {"1x", "Normal (no scaling)", GFX_NORMAL},
      {"2x", "2x", GFX_DOUBLESIZE},
      {"3x", "3x", GFX_TRIPLESIZE},
      {"2xsai", "2xSAI", GFX_2XSAI},
      {"super2xsai", "Super2xSAI", GFX_SUPER2XSAI},
      {"supereagle", "SuperEagle", GFX_SUPEREAGLE},
      {"advmame2x", "AdvMAME2x", GFX_ADVMAME2X},
      {"advmame3x", "AdvMAME3x", GFX_ADVMAME3X},
#ifndef DISABLE_HQ_SCALERS
      {"hq2x", "HQ2x", GFX_HQ2X},
      {"hq3x", "HQ3x", GFX_HQ3X},
#endif
      {"tv2x", "TV2x", GFX_TV2X},
      {"dotmatrix", "DotMatrix", GFX_DOTMATRIX},
      {0, 0, 0}
};

// Table of relative scalers magnitudes
// [definedScale - 1][_scaleFactor - 1]
static ScalerProc *scalersMagn[3][3] = {
#ifndef DISABLE_SCALERS
      { Normal1x, AdvMame2x, AdvMame3x },
      { Normal1x, Normal1x, Normal1o5x },
      { Normal1x, Normal1x, Normal1x }
#else // remove dependencies on other scalers
      { Normal1x, Normal1x, Normal1x },
      { Normal1x, Normal1x, Normal1x },
      { Normal1x, Normal1x, Normal1x }
#endif
};

static const int s_gfxModeSwitchTable[][4] = {
            { GFX_NORMAL, GFX_DOUBLESIZE, GFX_TRIPLESIZE, -1 },
            { GFX_NORMAL, GFX_ADVMAME2X, GFX_ADVMAME3X, -1 },
            { GFX_NORMAL, GFX_HQ2X, GFX_HQ3X, -1 },
            { GFX_NORMAL, GFX_2XSAI, -1, -1 },
            { GFX_NORMAL, GFX_SUPER2XSAI, -1, -1 },
            { GFX_NORMAL, GFX_SUPEREAGLE, -1, -1 },
            { GFX_NORMAL, GFX_TV2X, -1, -1 },
            { GFX_NORMAL, GFX_DOTMATRIX, -1, -1 }
      };

#ifndef DISABLE_SCALERS
static int cursorStretch200To240(uint8 *buf, uint32 pitch, int width, int height, int srcX, int srcY, int origSrcY);
#endif

const OSystem::GraphicsMode *OSystem_SDL::getSupportedGraphicsModes() const {
      return s_supportedGraphicsModes;
}

int OSystem_SDL::getDefaultGraphicsMode() const {
      return GFX_DOUBLESIZE;
}

void OSystem_SDL::beginGFXTransaction(void) {
      assert (_transactionMode == kTransactionNone);

      _transactionMode = kTransactionActive;

      _transactionDetails.modeChanged = false;
      _transactionDetails.sizeChanged = false;
      _transactionDetails.arChanged = false;
      _transactionDetails.fsChanged = false;

      _transactionDetails.needHotswap = false;
      _transactionDetails.needUpdatescreen = false;
      _transactionDetails.needUnload = false;

      _transactionDetails.normal1xScaler = false;
}

void OSystem_SDL::endGFXTransaction(void) {
      // for each engine we run initCommonGFX() as first thing in the transaction
      // and initSize() is called later. If user runs launcher at 320x200 with
      // 2x overlay, setting to Nomral1x sclaler in that case will be suppressed
      // and backend is forced to 2x
      //
      // This leads to bad results such as 1280x960 window for 640x480 engines.
      // To prevent that we rerun setGraphicsMode() if there was 1x scaler request
      if (_transactionDetails.normal1xScaler)
            setGraphicsMode(GFX_NORMAL);

      assert (_transactionMode == kTransactionActive);

      _transactionMode = kTransactionCommit;
      if (_transactionDetails.modeChanged)
            setGraphicsMode(_transactionDetails.mode);

      if (_transactionDetails.sizeChanged)
            initSize(_transactionDetails.w, _transactionDetails.h);

      if (_transactionDetails.arChanged)
            setAspectRatioCorrection(_transactionDetails.ar);

      if (_transactionDetails.needUnload) {
            unloadGFXMode();
            loadGFXMode();
            clearOverlay();
      } else {
            if (!_transactionDetails.fsChanged) {
                  if (_transactionDetails.needHotswap)
                        hotswapGFXMode();
                  else if (_transactionDetails.needUpdatescreen)
                        internUpdateScreen();
            }
      }

      if (_transactionDetails.fsChanged)
            setFullscreenMode(_transactionDetails.fs);

      _transactionMode = kTransactionNone;
}

bool OSystem_SDL::setGraphicsMode(int mode) {
      Common::StackLock lock(_graphicsMutex);

      int newScaleFactor = 1;
      ScalerProc *newScalerProc;

      switch(mode) {
      case GFX_NORMAL:
            newScaleFactor = 1;
            newScalerProc = Normal1x;
            break;
#ifndef DISABLE_SCALERS
      case GFX_DOUBLESIZE:
            newScaleFactor = 2;
            newScalerProc = Normal2x;
            break;
      case GFX_TRIPLESIZE:
            newScaleFactor = 3;
            newScalerProc = Normal3x;
            break;

      case GFX_2XSAI:
            newScaleFactor = 2;
            newScalerProc = _2xSaI;
            break;
      case GFX_SUPER2XSAI:
            newScaleFactor = 2;
            newScalerProc = Super2xSaI;
            break;
      case GFX_SUPEREAGLE:
            newScaleFactor = 2;
            newScalerProc = SuperEagle;
            break;
      case GFX_ADVMAME2X:
            newScaleFactor = 2;
            newScalerProc = AdvMame2x;
            break;
      case GFX_ADVMAME3X:
            newScaleFactor = 3;
            newScalerProc = AdvMame3x;
            break;
#ifndef DISABLE_HQ_SCALERS
      case GFX_HQ2X:
            newScaleFactor = 2;
            newScalerProc = HQ2x;
            break;
      case GFX_HQ3X:
            newScaleFactor = 3;
            newScalerProc = HQ3x;
            break;
#endif
      case GFX_TV2X:
            newScaleFactor = 2;
            newScalerProc = TV2x;
            break;
      case GFX_DOTMATRIX:
            newScaleFactor = 2;
            newScalerProc = DotMatrix;
            break;
#endif // DISABLE_SCALERS

      default:
            warning("unknown gfx mode %d", mode);
            return false;
      }

      _transactionDetails.normal1xScaler = (mode == GFX_NORMAL);

      _mode = mode;
      _scalerProc = newScalerProc;

      if (_transactionMode == kTransactionActive) {
            _transactionDetails.mode = mode;
            _transactionDetails.modeChanged = true;

            if (newScaleFactor != _scaleFactor) {
                  _transactionDetails.needHotswap = true;
                  _scaleFactor = newScaleFactor;
            }

            _transactionDetails.needUpdatescreen = true;

            return true;
      }

      // NOTE: This should not be executed at transaction commit
      //   Otherwise there is some unsolicited setGraphicsMode() call
      //   which should be properly removed
      if (newScaleFactor != _scaleFactor) {
            assert(_transactionMode != kTransactionCommit);

            _scaleFactor = newScaleFactor;
            hotswapGFXMode();
      }

      // Determine the "scaler type", i.e. essentially an index into the
      // s_gfxModeSwitchTable array defined in events.cpp.
      if (_mode != GFX_NORMAL) {
            for (int i = 0; i < ARRAYSIZE(s_gfxModeSwitchTable); i++) {
                  if (s_gfxModeSwitchTable[i][1] == _mode || s_gfxModeSwitchTable[i][2] == _mode) {
                        _scalerType = i;
                        break;
                  }
            }
      }

      if (!_screen)
            return true;

      // Blit everything to the screen
      _forceFull = true;

      // Even if the old and new scale factors are the same, we may have a
      // different scaler for the cursor now.
      blitCursor();

      if (_transactionMode != kTransactionCommit)
            internUpdateScreen();

      // Make sure that an EVENT_SCREEN_CHANGED gets sent later
      _modeChanged = true;

      return true;
}

int OSystem_SDL::getGraphicsMode() const {
      assert (_transactionMode == kTransactionNone);
      return _mode;
}

void OSystem_SDL::initSize(uint w, uint h) {
      // Avoid redundant res changes
      if ((int)w == _screenWidth && (int)h == _screenHeight &&
            _transactionMode != kTransactionCommit)
            return;

      _screenWidth = w;
      _screenHeight = h;

      _cksumNum = (_screenWidth * _screenHeight / (8 * 8));

      if (_transactionMode == kTransactionActive) {
            _transactionDetails.w = w;
            _transactionDetails.h = h;
            _transactionDetails.sizeChanged = true;

            _transactionDetails.needUnload = true;

            return;
      }

      free(_dirtyChecksums);
      _dirtyChecksums = (uint32 *)calloc(_cksumNum * 2, sizeof(uint32));

      if (_transactionMode != kTransactionCommit) {
            unloadGFXMode();
            loadGFXMode();

            // if initSize() gets called in the middle, overlay is not transparent
            clearOverlay();
      }
}

void OSystem_SDL::loadGFXMode() {
      assert(_inited);
      _forceFull = true;
      _modeFlags |= DF_UPDATE_EXPAND_1_PIXEL;

      int hwW, hwH;

#ifndef __MAEMO__
      _overlayWidth = _screenWidth * _scaleFactor;
      _overlayHeight = _screenHeight * _scaleFactor;

      if (_screenHeight != 200)
            _adjustAspectRatio = false;

      if (_adjustAspectRatio)
            _overlayHeight = real2Aspect(_overlayHeight);

      hwW = _screenWidth * _scaleFactor;
      hwH = effectiveScreenHeight();
#else
      hwW = _overlayWidth;
      hwH = _overlayHeight;
#endif

      //
      // Create the surface that contains the 8 bit game data
      //
      _screen = SDL_CreateRGBSurface(SDL_SWSURFACE, _screenWidth, _screenHeight, 8, 0, 0, 0, 0);
      if (_screen == NULL)
            error("allocating _screen failed");

      //
      // Create the surface that contains the scaled graphics in 16 bit mode
      //

      _hwscreen = SDL_SetVideoMode(hwW, hwH, 16,
            _fullscreen ? (SDL_FULLSCREEN|SDL_SWSURFACE) : SDL_SWSURFACE
      );
      if (_hwscreen == NULL) {
            // DON'T use error(), as this tries to bring up the debug
            // console, which WON'T WORK now that _hwscreen is hosed.

            // FIXME: We should be able to continue the game without
            // shutting down or bringing up the debug console, but at
            // this point we've already screwed up all our member vars.
            // We need to find a way to call SDL_SetVideoMode *before*
            // that happens and revert to all the old settings if we
            // can't pull off the switch to the new settings.
            //
            // Fingolfin says: the "easy" way to do that is not to modify
            // the member vars before we are sure everything is fine. Think
            // of "transactions, commit, rollback" style... we use local vars
            // in place of the member vars, do everything etc. etc.. In case
            // of a failure, rollback is trivial. Only if everything worked fine
            // do we "commit" the changed values to the member vars.
            warning("SDL_SetVideoMode says we can't switch to that mode (%s)", SDL_GetError());
            quit();
      }

      //
      // Create the surface used for the graphics in 16 bit before scaling, and also the overlay
      //

      // Distinguish 555 and 565 mode
      if (_hwscreen->format->Rmask == 0x7C00)
            InitScalers(555);
      else
            InitScalers(565);

      // Need some extra bytes around when using 2xSaI
      _tmpscreen = SDL_CreateRGBSurface(SDL_SWSURFACE, _screenWidth + 3, _screenHeight + 3,
                                    16,
                                    _hwscreen->format->Rmask,
                                    _hwscreen->format->Gmask,
                                    _hwscreen->format->Bmask,
                                    _hwscreen->format->Amask);

      if (_tmpscreen == NULL)
            error("allocating _tmpscreen failed");

      _overlayscreen = SDL_CreateRGBSurface(SDL_SWSURFACE, _overlayWidth, _overlayHeight,
                                    16,
                                    _hwscreen->format->Rmask,
                                    _hwscreen->format->Gmask,
                                    _hwscreen->format->Bmask,
                                    _hwscreen->format->Amask);

      if (_overlayscreen == NULL)
            error("allocating _overlayscreen failed");

      _tmpscreen2 = SDL_CreateRGBSurface(SDL_SWSURFACE, _overlayWidth + 3, _overlayHeight + 3,
                                    16,
                                    _hwscreen->format->Rmask,
                                    _hwscreen->format->Gmask,
                                    _hwscreen->format->Bmask,
                                    _hwscreen->format->Amask);

      if (_tmpscreen2 == NULL)
            error("allocating _tmpscreen2 failed");

#ifdef USE_OSD
      _osdSurface = SDL_CreateRGBSurface(SDL_SWSURFACE | SDL_RLEACCEL | SDL_SRCCOLORKEY | SDL_SRCALPHA,
                                    _hwscreen->w,
                                    _hwscreen->h,
                                    16,
                                    _hwscreen->format->Rmask,
                                    _hwscreen->format->Gmask,
                                    _hwscreen->format->Bmask,
                                    _hwscreen->format->Amask);
      if (_osdSurface == NULL)
            error("allocating _osdSurface failed");
      SDL_SetColorKey(_osdSurface, SDL_RLEACCEL | SDL_SRCCOLORKEY | SDL_SRCALPHA, kOSDColorKey);
#endif

      // keyboard cursor control, some other better place for it?
      _km.x_max = _screenWidth * _scaleFactor - 1;
      _km.y_max = effectiveScreenHeight() - 1;
      _km.delay_time = 25;
      _km.last_time = 0;
}

void OSystem_SDL::unloadGFXMode() {
      if (_screen) {
            SDL_FreeSurface(_screen);
            _screen = NULL;
      }

      if (_hwscreen) {
            SDL_FreeSurface(_hwscreen);
            _hwscreen = NULL;
      }

      if (_tmpscreen) {
            SDL_FreeSurface(_tmpscreen);
            _tmpscreen = NULL;
      }

      if (_tmpscreen2) {
            SDL_FreeSurface(_tmpscreen2);
            _tmpscreen2 = NULL;
      }

      if (_overlayscreen) {
            SDL_FreeSurface(_overlayscreen);
            _overlayscreen = NULL;
      }

#ifdef USE_OSD
      if (_osdSurface) {
            SDL_FreeSurface(_osdSurface);
            _osdSurface = NULL;
      }
#endif
}

void OSystem_SDL::hotswapGFXMode() {
      if (!_screen)
            return;

      // Keep around the old _screen & _overlayscreen so we can restore the screen data
      // after the mode switch.
      SDL_Surface *old_screen = _screen;
      SDL_Surface *old_overlayscreen = _overlayscreen;

      // Release the HW screen surface
      SDL_FreeSurface(_hwscreen);

      SDL_FreeSurface(_tmpscreen);
      SDL_FreeSurface(_tmpscreen2);

#ifdef USE_OSD
      // Release the OSD surface
      SDL_FreeSurface(_osdSurface);
#endif

      // Setup the new GFX mode
      loadGFXMode();

      // reset palette
      SDL_SetColors(_screen, _currentPalette, 0, 256);

      // Restore old screen content
      SDL_BlitSurface(old_screen, NULL, _screen, NULL);
      SDL_BlitSurface(old_overlayscreen, NULL, _overlayscreen, NULL);

      // Free the old surfaces
      SDL_FreeSurface(old_screen);
      SDL_FreeSurface(old_overlayscreen);

      // Update cursor to new scale
      blitCursor();

      // Blit everything to the screen
      internUpdateScreen();

      // Make sure that an EVENT_SCREEN_CHANGED gets sent later
      _modeChanged = true;
}

void OSystem_SDL::updateScreen() {
      assert (_transactionMode == kTransactionNone);

      Common::StackLock lock(_graphicsMutex);   // Lock the mutex until this function ends

      internUpdateScreen();
}

void OSystem_SDL::internUpdateScreen() {
      SDL_Surface *srcSurf, *origSurf;
      int height, width;
      ScalerProc *scalerProc;
      int scale1;

#if defined (DEBUG) && ! defined(_WIN32_WCE) // definitions not available for non-DEBUG here. (needed this to compile in SYMBIAN32 & linux?)
      assert(_hwscreen != NULL);
      assert(_hwscreen->map->sw_data != NULL);
#endif

      // If the shake position changed, fill the dirty area with blackness
      if (_currentShakePos != _newShakePos) {
            SDL_Rect blackrect = {0, 0, _screenWidth * _scaleFactor, _newShakePos * _scaleFactor};

            if (_adjustAspectRatio && !_overlayVisible)
                  blackrect.h = real2Aspect(blackrect.h - 1) + 1;

            SDL_FillRect(_hwscreen, &blackrect, 0);

            _currentShakePos = _newShakePos;

            _forceFull = true;
      }

      // Check whether the palette was changed in the meantime and update the
      // screen surface accordingly.
      if (_paletteDirtyEnd != 0) {
            SDL_SetColors(_screen, _currentPalette + _paletteDirtyStart,
                  _paletteDirtyStart,
                  _paletteDirtyEnd - _paletteDirtyStart);

            _paletteDirtyEnd = 0;

            _forceFull = true;
      }

#ifdef USE_OSD
      // OSD visible (i.e. non-transparent)?
      if (_osdAlpha != SDL_ALPHA_TRANSPARENT) {
            // Updated alpha value
            const int diff = SDL_GetTicks() - _osdFadeStartTime;
            if (diff > 0) {
                  if (diff >= kOSDFadeOutDuration) {
                        // Back to full transparency
                        _osdAlpha = SDL_ALPHA_TRANSPARENT;
                  } else {
                        // Do a linear fade out...
                        const int startAlpha = SDL_ALPHA_TRANSPARENT + kOSDInitialAlpha * (SDL_ALPHA_OPAQUE - SDL_ALPHA_TRANSPARENT) / 100;
                        _osdAlpha = startAlpha + diff * (SDL_ALPHA_TRANSPARENT - startAlpha) / kOSDFadeOutDuration;
                  }
                  SDL_SetAlpha(_osdSurface, SDL_RLEACCEL | SDL_SRCCOLORKEY | SDL_SRCALPHA, _osdAlpha);
                  _forceFull = true;
            }
      }
#endif

      if (!_overlayVisible) {
            origSurf = _screen;
            srcSurf = _tmpscreen;
            width = _screenWidth;
            height = _screenHeight;
            scalerProc = _scalerProc;
            scale1 = _scaleFactor;
      } else {
            origSurf = _overlayscreen;
            srcSurf = _tmpscreen2;
            width = _overlayWidth;
            height = _overlayHeight;
            scalerProc = Normal1x;

            scale1 = 1;
      }

      // Force a full redraw if requested
      if (_forceFull) {
            _numDirtyRects = 1;
            _dirtyRectList[0].x = 0;
            _dirtyRectList[0].y = 0;
            _dirtyRectList[0].w = width;
            _dirtyRectList[0].h = height;
      } else
            undrawMouse();

      // Only draw anything if necessary
      if (_numDirtyRects > 0) {

            SDL_Rect *r;
            SDL_Rect dst;
            uint32 srcPitch, dstPitch;
            SDL_Rect *lastRect = _dirtyRectList + _numDirtyRects;

            if (scalerProc == Normal1x && !_adjustAspectRatio && 0) {
                  for (r = _dirtyRectList; r != lastRect; ++r) {
                        dst = *r;

                        dst.y += _currentShakePos;
                        if (SDL_BlitSurface(origSurf, r, _hwscreen, &dst) != 0)
                              error("SDL_BlitSurface failed: %s", SDL_GetError());
                  }
            } else {
                  for (r = _dirtyRectList; r != lastRect; ++r) {
                        dst = *r;
                        dst.x++;    // Shift rect by one since 2xSai needs to acces the data around
                        dst.y++;    // any pixel to scale it, and we want to avoid mem access crashes.

                        if (SDL_BlitSurface(origSurf, r, srcSurf, &dst) != 0)
                              error("SDL_BlitSurface failed: %s", SDL_GetError());
                  }

                  SDL_LockSurface(srcSurf);
                  SDL_LockSurface(_hwscreen);

                  srcPitch = srcSurf->pitch;
                  dstPitch = _hwscreen->pitch;

                  for (r = _dirtyRectList; r != lastRect; ++r) {
                        register int dst_y = r->y + _currentShakePos;
                        register int dst_h = 0;
                        register int orig_dst_y = 0;
                        register int rx1 = r->x * scale1;

                        if (dst_y < height) {
                              dst_h = r->h;
                              if (dst_h > height - dst_y)
                                    dst_h = height - dst_y;

                              orig_dst_y = dst_y;
                              dst_y = dst_y * scale1;

                              if (_adjustAspectRatio && !_overlayVisible)
                                    dst_y = real2Aspect(dst_y);

                              assert(scalerProc != NULL);
                              scalerProc((byte *)srcSurf->pixels + (r->x * 2 + 2) + (r->y + 1) * srcPitch, srcPitch,
                                             (byte *)_hwscreen->pixels + rx1 * 2 + dst_y * dstPitch, dstPitch, r->w, dst_h);
                        }

                        r->x = rx1;
                        r->y = dst_y;
                        r->w = r->w * scale1;
                        r->h = dst_h * scale1;

#ifndef DISABLE_SCALERS
                        if (_adjustAspectRatio && orig_dst_y < height && !_overlayVisible)
                              r->h = stretch200To240((uint8 *) _hwscreen->pixels, dstPitch, r->w, r->h, r->x, r->y, orig_dst_y * scale1);
#endif
                  }
                  SDL_UnlockSurface(srcSurf);
                  SDL_UnlockSurface(_hwscreen);
            }

            // Readjust the dirty rect list in case we are doing a full update.
            // This is necessary if shaking is active.
            if (_forceFull) {
                  _dirtyRectList[0].y = 0;
                  _dirtyRectList[0].h = effectiveScreenHeight();
            }

            drawMouse();

#ifdef USE_OSD
            if (_osdAlpha != SDL_ALPHA_TRANSPARENT) {
                  SDL_BlitSurface(_osdSurface, 0, _hwscreen, 0);
            }
#endif
            // Finally, blit all our changes to the screen
            SDL_UpdateRects(_hwscreen, _numDirtyRects, _dirtyRectList);
      } else {
            drawMouse();
            if (_numDirtyRects)
                  SDL_UpdateRects(_hwscreen, _numDirtyRects, _dirtyRectList);
      }

      _numDirtyRects = 0;
      _forceFull = false;
}

bool OSystem_SDL::saveScreenshot(const char *filename) {
      assert(_hwscreen != NULL);

      Common::StackLock lock(_graphicsMutex);   // Lock the mutex until this function ends
      return SDL_SaveBMP(_hwscreen, filename) == 0;
}

void OSystem_SDL::setFullscreenMode(bool enable) {
      Common::StackLock lock(_graphicsMutex);

      if (_fullscreen != enable || _transactionMode == kTransactionCommit) {
            assert(_hwscreen != 0);
            _fullscreen = enable;

            if (_transactionMode == kTransactionActive) {
                  _transactionDetails.fs = enable;
                  _transactionDetails.fsChanged = true;

                  _transactionDetails.needHotswap = true;

                  return;
            }

#if (defined(MACOSX) && !SDL_VERSION_ATLEAST(1, 2, 6)) || defined(__MAEMO__)
            // On OS X, SDL_WM_ToggleFullScreen is currently not implemented. Worse,
            // before SDL 1.2.6 it always returned -1 (which would indicate a
            // successful switch). So we simply don't call it at all and use
            // hotswapGFXMode() directly to switch to fullscreen mode.
            hotswapGFXMode();
#else
            if (!SDL_WM_ToggleFullScreen(_hwscreen)) {
                  // if ToggleFullScreen fails, achieve the same effect with hotswap gfx mode
                  hotswapGFXMode();
            } else {
                  // Blit everything to the screen
                  internUpdateScreen();

                  // Make sure that an EVENT_SCREEN_CHANGED gets sent later
                  _modeChanged = true;
            }
#endif
      }
}

void OSystem_SDL::setAspectRatioCorrection(bool enable) {
      if ((_screenHeight == 200 && _adjustAspectRatio != enable) ||
            _transactionMode == kTransactionCommit) {
            Common::StackLock lock(_graphicsMutex);

            //assert(_hwscreen != 0);
            _adjustAspectRatio = enable;

            if (_transactionMode == kTransactionActive) {
                  _transactionDetails.ar = enable;
                  _transactionDetails.arChanged = true;

                  _transactionDetails.needHotswap = true;

                  return;
            } else {
                  if (_transactionMode != kTransactionCommit)
                        hotswapGFXMode();
            }

            // Make sure that an EVENT_SCREEN_CHANGED gets sent later
            _modeChanged = true;
      }
}

void OSystem_SDL::clearScreen() {
      assert (_transactionMode == kTransactionNone);

      // Try to lock the screen surface
      if (SDL_LockSurface(_screen) == -1)
            error("SDL_LockSurface failed: %s", SDL_GetError());

      byte *dst = (byte *)_screen->pixels;

      // Clear the screen
      memset(dst, 0, _screenWidth * _screenHeight);

      // Unlock the screen surface
      SDL_UnlockSurface(_screen);
}

void OSystem_SDL::copyRectToScreen(const byte *src, int pitch, int x, int y, int w, int h) {
      assert (_transactionMode == kTransactionNone);
      assert(src);

      if (_screen == NULL)
            return;

      Common::StackLock lock(_graphicsMutex);   // Lock the mutex until this function ends

      assert(x >= 0 && x < _screenWidth);
      assert(y >= 0 && y < _screenHeight);
      assert(h > 0 && y + h <= _screenHeight);
      assert(w > 0 && x + w <= _screenWidth);

      if (((long)src & 3) == 0 && pitch == _screenWidth && x == 0 && y == 0 &&
                  w == _screenWidth && h == _screenHeight && _modeFlags & DF_WANT_RECT_OPTIM) {
            /* Special, optimized case for full screen updates.
             * It tries to determine what areas were actually changed,
             * and just updates those, on the actual display. */
            addDirtyRgnAuto(src);
      } else {
            /* Clip the coordinates */
            if (x < 0) {
                  w += x;
                  src -= x;
                  x = 0;
            }

            if (y < 0) {
                  h += y;
                  src -= y * pitch;
                  y = 0;
            }

            if (w > _screenWidth - x) {
                  w = _screenWidth - x;
            }

            if (h > _screenHeight - y) {
                  h = _screenHeight - y;
            }

            if (w <= 0 || h <= 0)
                  return;

            _cksumValid = false;
            addDirtyRect(x, y, w, h);
      }

      // Try to lock the screen surface
      if (SDL_LockSurface(_screen) == -1)
            error("SDL_LockSurface failed: %s", SDL_GetError());

      byte *dst = (byte *)_screen->pixels + y * _screenWidth + x;

      if (_screenWidth == pitch && pitch == w) {
            memcpy(dst, src, h*w);
      } else {
            do {
                  memcpy(dst, src, w);
                  src += pitch;
                  dst += _screenWidth;
            } while (--h);
      }

      // Unlock the screen surface
      SDL_UnlockSurface(_screen);
}

bool OSystem_SDL::grabRawScreen(Graphics::Surface *surf) {
      assert(_screen);
      assert(surf);

      Common::StackLock lock(_graphicsMutex);   // Lock the mutex until this function ends

      surf->create(_screenWidth, _screenHeight, _screen->format->BytesPerPixel);

      // Try to lock the screen surface
      if (SDL_LockSurface(_screen) == -1)
            error("SDL_LockSurface failed: %s", SDL_GetError());

      memcpy(surf->pixels, _screen->pixels, _screenWidth * _screenHeight * _screen->format->BytesPerPixel);

      // Unlock the screen surface
      SDL_UnlockSurface(_screen);

      return true;
}

void OSystem_SDL::addDirtyRect(int x, int y, int w, int h, bool realCoordinates) {
      if (_forceFull)
            return;

      if (_numDirtyRects == NUM_DIRTY_RECT) {
            _forceFull = true;
            return;
      }

      int height, width;

      if (!_overlayVisible && !realCoordinates) {
            width = _screenWidth;
            height = _screenHeight;
      } else {
            width = _overlayWidth;
            height = _overlayHeight;
      }

      // Extend the dirty region by 1 pixel for scalers
      // that "smear" the screen, e.g. 2xSAI
      if ((_modeFlags & DF_UPDATE_EXPAND_1_PIXEL) && !realCoordinates) {
            x--;
            y--;
            w+=2;
            h+=2;
      }

      // clip
      if (x < 0) {
            w += x;
            x = 0;
      }

      if (y < 0) {
            h += y;
            y=0;
      }

      if (w > width - x) {
            w = width - x;
      }

      if (h > height - y) {
            h = height - y;
      }

#ifndef DISABLE_SCALERS
      if (_adjustAspectRatio && !_overlayVisible && !realCoordinates) {
            makeRectStretchable(x, y, w, h);
      }
#endif

      if (w == width && h == height) {
            _forceFull = true;
            return;
      }

      if (w > 0 && h > 0) {
            SDL_Rect *r = &_dirtyRectList[_numDirtyRects++];

            r->x = x;
            r->y = y;
            r->w = w;
            r->h = h;
      }
}


void OSystem_SDL::makeChecksums(const byte *buf) {
      assert(buf);
      uint32 *sums = _dirtyChecksums;
      uint x,y;
      const uint last_x = (uint)_screenWidth / 8;
      const uint last_y = (uint)_screenHeight / 8;

      const uint BASE = 65521; /* largest prime smaller than 65536 */

      /* the 8x8 blocks in buf are enumerated starting in the top left corner and
       * reading each line at a time from left to right */
      for(y = 0; y != last_y; y++, buf += _screenWidth * (8 - 1))
            for(x = 0; x != last_x; x++, buf += 8) {
                  // Adler32 checksum algorithm (from RFC1950, used by gzip and zlib).
                  // This computes the Adler32 checksum of a 8x8 pixel block. Note
                  // that we can do the modulo operation (which is the slowest part)
                  // of the algorithm) at the end, instead of doing each iteration,
                  // since we only have 64 iterations in total - and thus s1 and
                  // s2 can't overflow anyway.
                  uint32 s1 = 1;
                  uint32 s2 = 0;
                  const byte *ptr = buf;
                  for (int subY = 0; subY < 8; subY++) {
                        for (int subX = 0; subX < 8; subX++) {
                              s1 += ptr[subX];
                              s2 += s1;
                        }
                        ptr += _screenWidth;
                  }

                  s1 %= BASE;
                  s2 %= BASE;

                  /* output the checksum for this block */
                  *sums++ =  (s2 << 16) + s1;
      }
}

void OSystem_SDL::addDirtyRgnAuto(const byte *buf) {
      assert(buf);
      assert(((long)buf & 3) == 0);

      /* generate a table of the checksums */
      makeChecksums(buf);

      if (!_cksumValid) {
            _forceFull = true;
            _cksumValid = true;
      }

      /* go through the checksum list, compare it with the previous checksums,
             and add all dirty rectangles to a list. try to combine small rectangles
             into bigger ones in a simple way */
      if (!_forceFull) {
            int x, y, w;
            uint32 *ck = _dirtyChecksums;

            for(y = 0; y != _screenHeight / 8; y++) {
                  for(x = 0; x != _screenWidth / 8; x++, ck++) {
                        if (ck[0] != ck[_cksumNum]) {
                              /* found a dirty 8x8 block, now go as far to the right as possible,
                                     and at the same time, unmark the dirty status by setting old to new. */
                              w=0;
                              do {
                                    ck[w + _cksumNum] = ck[w];
                                    w++;
                              } while (x + w != _screenWidth / 8 && ck[w] != ck[w + _cksumNum]);

                              addDirtyRect(x * 8, y * 8, w * 8, 8);

                              if (_forceFull)
                                    goto get_out;
                        }
                  }
            }
      } else {
            get_out:;
            /* Copy old checksums to new */
            memcpy(_dirtyChecksums + _cksumNum, _dirtyChecksums, _cksumNum * sizeof(uint32));
      }
}

int16 OSystem_SDL::getHeight() {
      return _screenHeight;
}

int16 OSystem_SDL::getWidth() {
      return _screenWidth;
}

void OSystem_SDL::setPalette(const byte *colors, uint start, uint num) {
      assert(colors);
      const byte *b = colors;
      uint i;
      SDL_Color *base = _currentPalette + start;
      for (i = 0; i < num; i++) {
            base[i].r = b[0];
            base[i].g = b[1];
            base[i].b = b[2];
            b += 4;
      }

      if (start < _paletteDirtyStart)
            _paletteDirtyStart = start;

      if (start + num > _paletteDirtyEnd)
            _paletteDirtyEnd = start + num;

      // Some games blink cursors with palette
      if (_cursorPaletteDisabled)
            blitCursor();
}

void OSystem_SDL::grabPalette(byte *colors, uint start, uint num) {
      assert(colors);
      const SDL_Color *base = _currentPalette + start;

      for (uint i = 0; i < num; ++i) {
            colors[i * 4] = base[i].r;
            colors[i * 4 + 1] = base[i].g;
            colors[i * 4 + 2] = base[i].b;
            colors[i * 4 + 3] = 0xFF;
      }
}

void OSystem_SDL::setCursorPalette(const byte *colors, uint start, uint num) {
      assert(colors);
      const byte *b = colors;
      uint i;
      SDL_Color *base = _cursorPalette + start;
      for (i = 0; i < num; i++) {
            base[i].r = b[0];
            base[i].g = b[1];
            base[i].b = b[2];
            b += 4;
      }

      _cursorPaletteDisabled = false;

      blitCursor();
}

void OSystem_SDL::setShakePos(int shake_pos) {
      assert (_transactionMode == kTransactionNone);

      _newShakePos = shake_pos;
}


#pragma mark -
#pragma mark --- Overlays ---
#pragma mark -

void OSystem_SDL::showOverlay() {
      assert (_transactionMode == kTransactionNone);

      int x, y;

      if (_overlayVisible)
            return;

      _overlayVisible = true;

      // Since resolution could change, put mouse to adjusted position
      // Fixes bug #1349059
      x = _mouseCurState.x * _scaleFactor;
      if (_adjustAspectRatio)
            y = real2Aspect(_mouseCurState.y) * _scaleFactor;
      else
            y = _mouseCurState.y * _scaleFactor;

      warpMouse(x, y);

      clearOverlay();
}

void OSystem_SDL::hideOverlay() {
      assert (_transactionMode == kTransactionNone);

      if (!_overlayVisible)
            return;

      int x, y;

      _overlayVisible = false;

      // Since resolution could change, put mouse to adjusted position
      // Fixes bug #1349059
      x = _mouseCurState.x / _scaleFactor;
      y = _mouseCurState.y / _scaleFactor;
      if (_adjustAspectRatio)
            y = aspect2Real(y);

      warpMouse(x, y);

      clearOverlay();

      _forceFull = true;
}

void OSystem_SDL::clearOverlay() {
      //assert (_transactionMode == kTransactionNone);

      Common::StackLock lock(_graphicsMutex);   // Lock the mutex until this function ends

      if (!_overlayVisible)
            return;

      // Clear the overlay by making the game screen "look through" everywhere.
      SDL_Rect src, dst;
      src.x = src.y = 0;
      dst.x = dst.y = 1;
      src.w = dst.w = _screenWidth;
      src.h = dst.h = _screenHeight;
      if (SDL_BlitSurface(_screen, &src, _tmpscreen, &dst) != 0)
            error("SDL_BlitSurface failed: %s", SDL_GetError());

      SDL_LockSurface(_tmpscreen);
      SDL_LockSurface(_overlayscreen);
      _scalerProc((byte *)(_tmpscreen->pixels) + _tmpscreen->pitch + 2, _tmpscreen->pitch, 
      (byte *)_overlayscreen->pixels, _overlayscreen->pitch, _screenWidth, _screenHeight);

#ifndef DISABLE_SCALERS
      if (_adjustAspectRatio)
            stretch200To240((uint8 *)_overlayscreen->pixels, _overlayscreen->pitch, 
                                    _overlayWidth, _screenHeight * _scaleFactor, 0, 0, 0);
#endif
      SDL_UnlockSurface(_tmpscreen);
      SDL_UnlockSurface(_overlayscreen);

      _forceFull = true;
}

void OSystem_SDL::grabOverlay(OverlayColor *buf, int pitch) {
      assert (_transactionMode == kTransactionNone);

      if (_overlayscreen == NULL)
            return;

      if (SDL_LockSurface(_overlayscreen) == -1)
            error("SDL_LockSurface failed: %s", SDL_GetError());

      byte *src = (byte *)_overlayscreen->pixels;
      int h = _overlayHeight;
      do {
            memcpy(buf, src, _overlayWidth * 2);
            src += _overlayscreen->pitch;
            buf += pitch;
      } while (--h);

      SDL_UnlockSurface(_overlayscreen);
}

void OSystem_SDL::copyRectToOverlay(const OverlayColor *buf, int pitch, int x, int y, int w, int h) {
      assert (_transactionMode == kTransactionNone);

      if (_overlayscreen == NULL)
            return;

      // Clip the coordinates
      if (x < 0) {
            w += x;
            buf -= x;
            x = 0;
      }

      if (y < 0) {
            h += y; buf -= y * pitch;
            y = 0;
      }

      if (w > _overlayWidth - x) {
            w = _overlayWidth - x;
      }

      if (h > _overlayHeight - y) {
            h = _overlayHeight - y;
      }

      if (w <= 0 || h <= 0)
            return;

      // Mark the modified region as dirty
      _cksumValid = false;
      addDirtyRect(x, y, w, h);

      if (SDL_LockSurface(_overlayscreen) == -1)
            error("SDL_LockSurface failed: %s", SDL_GetError());

      byte *dst = (byte *)_overlayscreen->pixels + y * _overlayscreen->pitch + x * 2;
      do {
            memcpy(dst, buf, w * 2);
            dst += _overlayscreen->pitch;
            buf += pitch;
      } while (--h);

      SDL_UnlockSurface(_overlayscreen);
}

OverlayColor OSystem_SDL::RGBToColor(uint8 r, uint8 g, uint8 b) {
      return SDL_MapRGB(_overlayscreen->format, r, g, b);
}

void OSystem_SDL::colorToRGB(OverlayColor color, uint8 &r, uint8 &g, uint8 &b) {
      SDL_GetRGB(color, _overlayscreen->format, &r, &g, &b);
}


#pragma mark -
#pragma mark --- Mouse ---
#pragma mark -

bool OSystem_SDL::showMouse(bool visible) {
      if (_mouseVisible == visible)
            return visible;

      bool last = _mouseVisible;
      _mouseVisible = visible;

      return last;
}

void OSystem_SDL::setMousePos(int x, int y) {
      if (x != _mouseCurState.x || y != _mouseCurState.y) {
            _mouseCurState.x = x;
            _mouseCurState.y = y;
      }
}

void OSystem_SDL::warpMouse(int x, int y) {
      int y1 = y;

      if (_adjustAspectRatio && !_overlayVisible)
            y1 = real2Aspect(y);

      if (_mouseCurState.x != x || _mouseCurState.y != y) {
            if (!_overlayVisible) 
                  SDL_WarpMouse(x * _scaleFactor, y1 * _scaleFactor);
            else
                  SDL_WarpMouse(x, y1);

            // SDL_WarpMouse() generates a mouse movement event, so
            // setMousePos() would be called eventually. However, the
            // cannon script in CoMI calls this function twice each time
            // the cannon is reloaded. Unless we update the mouse position
            // immediately the second call is ignored, causing the cannon
            // to change its aim.

            setMousePos(x, y);
      }
}

void OSystem_SDL::setMouseCursor(const byte *buf, uint w, uint h, int hotspot_x, int hotspot_y, byte keycolor, int cursorTargetScale) {
      if (w == 0 || h == 0)
            return;

      _mouseCurState.hotX = hotspot_x;
      _mouseCurState.hotY = hotspot_y;

      _mouseKeyColor = keycolor;

      _cursorTargetScale = cursorTargetScale;

      if (_mouseCurState.w != (int)w || _mouseCurState.h != (int)h) {
            _mouseCurState.w = w;
            _mouseCurState.h = h;

            if (_mouseOrigSurface)
                  SDL_FreeSurface(_mouseOrigSurface);

            // Allocate bigger surface because AdvMame2x adds black pixel at [0,0]
            _mouseOrigSurface = SDL_CreateRGBSurface(SDL_SWSURFACE | SDL_RLEACCEL | SDL_SRCCOLORKEY | SDL_SRCALPHA,
                                    _mouseCurState.w + 2,
                                    _mouseCurState.h + 2,
                                    16,
                                    _hwscreen->format->Rmask,
                                    _hwscreen->format->Gmask,
                                    _hwscreen->format->Bmask,
                                    _hwscreen->format->Amask);

            if (_mouseOrigSurface == NULL)
                  error("allocating _mouseOrigSurface failed");
            SDL_SetColorKey(_mouseOrigSurface, SDL_RLEACCEL | SDL_SRCCOLORKEY | SDL_SRCALPHA, kMouseColorKey);
      }

      free(_mouseData);

      _mouseData = (byte *)malloc(w * h);
      memcpy(_mouseData, buf, w * h);
      blitCursor();
}

void OSystem_SDL::blitCursor() {
      byte *dstPtr;
      const byte *srcPtr = _mouseData;
      byte color;
      int w, h, i, j;

      if (!_mouseOrigSurface || !_mouseData)
            return;

      w = _mouseCurState.w;
      h = _mouseCurState.h;

      SDL_LockSurface(_mouseOrigSurface);

      // Make whole surface transparent
      for (i = 0; i < h + 2; i++) {
            dstPtr = (byte *)_mouseOrigSurface->pixels + _mouseOrigSurface->pitch * i;
            for (j = 0; j < w + 2; j++) {
                  *(uint16 *)dstPtr = kMouseColorKey;
                  dstPtr += 2;
            }
      }

      // Draw from [1,1] since AdvMame2x adds artefact at 0,0
      dstPtr = (byte *)_mouseOrigSurface->pixels + _mouseOrigSurface->pitch + 2;

      SDL_Color *palette;

      if (_cursorPaletteDisabled)
            palette = _currentPalette;
      else
            palette = _cursorPalette;
      
      for (i = 0; i < h; i++) {
            for (j = 0; j < w; j++) {
                  color = *srcPtr;
                  if (color != _mouseKeyColor) {      // transparent, don't draw
                        *(uint16 *)dstPtr = SDL_MapRGB(_mouseOrigSurface->format,
                              palette[color].r, palette[color].g, palette[color].b);
                  }
                  dstPtr += 2;
                  srcPtr++;
            }
            dstPtr += _mouseOrigSurface->pitch - w * 2;
      }

      int rW, rH;

      if (_cursorTargetScale >= _scaleFactor) {
            // The cursor target scale is greater or equal to the scale at
            // which the rest of the screen is drawn. We do not downscale
            // the cursor image, we draw it at its original size. It will
            // appear too large on screen.

            rW = w;
            rH = h;
            _mouseCurState.rHotX = _mouseCurState.hotX;
            _mouseCurState.rHotY = _mouseCurState.hotY;

            // The virtual dimensions may be larger than the original.

            _mouseCurState.vW = w * _cursorTargetScale / _scaleFactor;
            _mouseCurState.vH = h * _cursorTargetScale / _scaleFactor;
            _mouseCurState.vHotX = _mouseCurState.hotX * _cursorTargetScale /
                  _scaleFactor;
            _mouseCurState.vHotY = _mouseCurState.hotY * _cursorTargetScale /
                  _scaleFactor;
      } else {
            // The cursor target scale is smaller than the scale at which
            // the rest of the screen is drawn. We scale up the cursor
            // image to make it appear correct.

            rW = w * _scaleFactor / _cursorTargetScale;
            rH = h * _scaleFactor / _cursorTargetScale;
            _mouseCurState.rHotX = _mouseCurState.hotX * _scaleFactor /
                  _cursorTargetScale;
            _mouseCurState.rHotY = _mouseCurState.hotY * _scaleFactor /
                  _cursorTargetScale;

            // The virtual dimensions will be the same as the original.

            _mouseCurState.vW = w;
            _mouseCurState.vH = h;
            _mouseCurState.vHotX = _mouseCurState.hotX;
            _mouseCurState.vHotY = _mouseCurState.hotY;
      }

      int rH1 = rH; // store original to pass to aspect-correction function later
      if (_adjustAspectRatio && _cursorTargetScale == 1) {
            rH = real2Aspect(rH - 1) + 1;
            _mouseCurState.rHotY = real2Aspect(_mouseCurState.rHotY);
      }

      if (_mouseCurState.rW != rW || _mouseCurState.rH != rH) {
            _mouseCurState.rW = rW;
            _mouseCurState.rH = rH;

            if (_mouseSurface)
                  SDL_FreeSurface(_mouseSurface);

            _mouseSurface = SDL_CreateRGBSurface(SDL_SWSURFACE | SDL_RLEACCEL | SDL_SRCCOLORKEY | SDL_SRCALPHA,
                                    _mouseCurState.rW,
                                    _mouseCurState.rH,
                                    16,
                                    _hwscreen->format->Rmask,
                                    _hwscreen->format->Gmask,
                                    _hwscreen->format->Bmask,
                                    _hwscreen->format->Amask);

            if (_mouseSurface == NULL)
                  error("allocating _mouseSurface failed");

            SDL_SetColorKey(_mouseSurface, SDL_RLEACCEL | SDL_SRCCOLORKEY | SDL_SRCALPHA, kMouseColorKey);
      }

      SDL_LockSurface(_mouseSurface);

      ScalerProc *scalerProc;

      // If possible, use the same scaler for the cursor as for the rest of
      // the game. This only works well with the non-blurring scalers so we
      // actually only use the 1x, 1.5x, 2x and AdvMame scalers.

      if (_cursorTargetScale == 1 && (_mode == GFX_DOUBLESIZE || _mode == GFX_TRIPLESIZE))
            scalerProc = _scalerProc;
      else
            scalerProc = scalersMagn[_cursorTargetScale - 1][_scaleFactor - 1];

      scalerProc((byte *)_mouseOrigSurface->pixels + _mouseOrigSurface->pitch + 2,
            _mouseOrigSurface->pitch, (byte *)_mouseSurface->pixels, _mouseSurface->pitch,
            _mouseCurState.w, _mouseCurState.h);

#ifndef DISABLE_SCALERS
      if (_adjustAspectRatio && _cursorTargetScale == 1)
            cursorStretch200To240((uint8 *)_mouseSurface->pixels, _mouseSurface->pitch, rW, rH1, 0, 0, 0);
#endif

      SDL_UnlockSurface(_mouseSurface);
      SDL_UnlockSurface(_mouseOrigSurface);
}

#ifndef DISABLE_SCALERS
// Basically it is kVeryFastAndUglyAspectMode of stretch200To240 from
// common/scale/aspect.cpp
static int cursorStretch200To240(uint8 *buf, uint32 pitch, int width, int height, int srcX, int srcY, int origSrcY) {
      int maxDstY = real2Aspect(origSrcY + height - 1);
      int y;
      const uint8 *startSrcPtr = buf + srcX * 2 + (srcY - origSrcY) * pitch;
      uint8 *dstPtr = buf + srcX * 2 + maxDstY * pitch;

      for (y = maxDstY; y >= srcY; y--) {
            const uint8 *srcPtr = startSrcPtr + aspect2Real(y) * pitch;

            if (srcPtr == dstPtr)
                  break;
            memcpy(dstPtr, srcPtr, width * 2);
            dstPtr -= pitch;
      }

      return 1 + maxDstY - srcY;
}
#endif

void OSystem_SDL::toggleMouseGrab() {
      if (SDL_WM_GrabInput(SDL_GRAB_QUERY) == SDL_GRAB_OFF)
            SDL_WM_GrabInput(SDL_GRAB_ON);
      else
            SDL_WM_GrabInput(SDL_GRAB_OFF);
}

void OSystem_SDL::undrawMouse() {
      const int x = _mouseBackup.x;
      const int y = _mouseBackup.y;

      // When we switch bigger overlay off mouse jumps. Argh!
      // This is intended to prevent undrawing offscreen mouse
      if (!_overlayVisible && (x >= _screenWidth || y >= _screenHeight)) {
            return;
      }

      if (_mouseBackup.w != 0 && _mouseBackup.h != 0)
            addDirtyRect(x, y, _mouseBackup.w, _mouseBackup.h);
}

void OSystem_SDL::drawMouse() {
      if (!_mouseVisible || !_mouseSurface) {
            _mouseBackup.x = _mouseBackup.y = _mouseBackup.w = _mouseBackup.h = 0;
            return;
      }

      SDL_Rect dst;
      int scale;
      int width, height;
      int hotX, hotY;

      dst.x = _mouseCurState.x;
      dst.y = _mouseCurState.y;

      if (!_overlayVisible) {
            scale = _scaleFactor;
            width = _screenWidth;
            height = _screenHeight;
            dst.w = _mouseCurState.vW;
            dst.h = _mouseCurState.vH;
            hotX = _mouseCurState.vHotX;
            hotY = _mouseCurState.vHotY;
      } else {
            scale = 1;
            width = _overlayWidth;
            height = _overlayHeight;
            dst.w = _mouseCurState.rW;
            dst.h = _mouseCurState.rH;
            hotX = _mouseCurState.rHotX;
            hotY = _mouseCurState.rHotY;
      }

      // The mouse is undrawn using virtual coordinates, i.e. they may be
      // scaled and aspect-ratio corrected.

      _mouseBackup.x = dst.x - hotX;
      _mouseBackup.y = dst.y - hotY;
      _mouseBackup.w = dst.w;
      _mouseBackup.h = dst.h;

      // We draw the pre-scaled cursor image, so now we need to adjust for
      // scaling, shake position and aspect ratio correction manually.

      if (!_overlayVisible) {
            dst.y += _currentShakePos;
      }

      if (_adjustAspectRatio && !_overlayVisible)
            dst.y = real2Aspect(dst.y);
  
      dst.x = scale * dst.x - _mouseCurState.rHotX;
      dst.y = scale * dst.y - _mouseCurState.rHotY;
      dst.w = _mouseCurState.rW;
      dst.h = _mouseCurState.rH;

      // Note that SDL_BlitSurface() and addDirtyRect() will both perform any
      // clipping necessary

      if (SDL_BlitSurface(_mouseSurface, NULL, _hwscreen, &dst) != 0)
            error("SDL_BlitSurface failed: %s", SDL_GetError());

      // The screen will be updated using real surface coordinates, i.e.
      // they will not be scaled or aspect-ratio corrected.

      addDirtyRect(dst.x, dst.y, dst.w, dst.h, true);
}

#pragma mark -
#pragma mark --- On Screen Display ---
#pragma mark -

#ifdef USE_OSD
void OSystem_SDL::displayMessageOnOSD(const char *msg) {
      assert (_transactionMode == kTransactionNone);
      assert(msg);

      uint i;

      // Lock the OSD surface for drawing
      if (SDL_LockSurface(_osdSurface))
            error("displayMessageOnOSD: SDL_LockSurface failed: %s", SDL_GetError());

      Graphics::Surface dst;
      dst.pixels = _osdSurface->pixels;
      dst.w = _osdSurface->w;
      dst.h = _osdSurface->h;
      dst.pitch = _osdSurface->pitch;
      dst.bytesPerPixel = _osdSurface->format->BytesPerPixel;

      // The font we are going to use:
      const Graphics::Font *font = FontMan.getFontByUsage(Graphics::FontManager::kOSDFont);

      // Clear everything with the "transparent" color, i.e. the colorkey
      SDL_FillRect(_osdSurface, 0, kOSDColorKey);

      // Split the message into separate lines.
      Common::StringList lines;
      const char *ptr;
      for (ptr = msg; *ptr; ++ptr) {
            if (*ptr == '\n') {
                  lines.push_back(Common::String(msg, ptr - msg));
                  msg = ptr + 1;
            }
      }
      lines.push_back(Common::String(msg, ptr - msg));

      // Determine a rect which would contain the message string (clipped to the
      // screen dimensions).
      const int vOffset = 6;
      const int lineSpacing = 1;
      const int lineHeight = font->getFontHeight() + 2 * lineSpacing;
      int width = 0;
      int height = lineHeight * lines.size() + 2 * vOffset;
      for (i = 0; i < lines.size(); i++) {
            width = MAX(width, font->getStringWidth(lines[i]) + 14);
      }

      // Clip the rect
      if (width > dst.w)
            width = dst.w;
      if (height > dst.h)
            height = dst.h;

      // Draw a dark gray rect
      // TODO: Rounded corners ? Border?
      SDL_Rect osdRect;
      osdRect.x = (dst.w - width) / 2;
      osdRect.y = (dst.h - height) / 2;
      osdRect.w = width;
      osdRect.h = height;
      SDL_FillRect(_osdSurface, &osdRect, SDL_MapRGB(_osdSurface->format, 64, 64, 64));

      // Render the message, centered, and in white
      for (i = 0; i < lines.size(); i++) {
            font->drawString(&dst, lines[i],
                                          osdRect.x, osdRect.y + i * lineHeight + vOffset + lineSpacing, osdRect.w,
                                          SDL_MapRGB(_osdSurface->format, 255, 255, 255),
                                          Graphics::kTextAlignCenter);
      }

      // Finished drawing, so unlock the OSD surface again
      SDL_UnlockSurface(_osdSurface);

      // Init the OSD display parameters, and the fade out
      _osdAlpha = SDL_ALPHA_TRANSPARENT +  kOSDInitialAlpha * (SDL_ALPHA_OPAQUE - SDL_ALPHA_TRANSPARENT) / 100;
      _osdFadeStartTime = SDL_GetTicks() + kOSDFadeOutDelay;
      SDL_SetAlpha(_osdSurface, SDL_RLEACCEL | SDL_SRCCOLORKEY | SDL_SRCALPHA, _osdAlpha);

      // Ensure a full redraw takes place next time the screen is updated
      _forceFull = true;
}
#endif


#pragma mark -
#pragma mark --- Misc ---
#pragma mark -

void OSystem_SDL::handleScalerHotkeys(const SDL_KeyboardEvent &key) {
      // Ctrl-Alt-a toggles aspect ratio correction
      if (key.keysym.sym == 'a') {
            setFeatureState(kFeatureAspectRatioCorrection, !_adjustAspectRatio);
#ifdef USE_OSD
            char buffer[128];
            if (_adjustAspectRatio)
                  sprintf(buffer, "Enabled aspect ratio correction\n%d x %d -> %d x %d",
                        _screenWidth, _screenHeight,
                        _hwscreen->w, _hwscreen->h
                        );
            else
                  sprintf(buffer, "Disabled aspect ratio correction\n%d x %d -> %d x %d",
                        _screenWidth, _screenHeight,
                        _hwscreen->w, _hwscreen->h
                        );
            displayMessageOnOSD(buffer);
#endif

            return;
      }

      int newMode = -1;
      int factor = _scaleFactor - 1;

      // Increase/decrease the scale factor
      if (key.keysym.sym == SDLK_EQUALS || key.keysym.sym == SDLK_PLUS || key.keysym.sym == SDLK_MINUS ||
            key.keysym.sym == SDLK_KP_PLUS || key.keysym.sym == SDLK_KP_MINUS) {
            factor += (key.keysym.sym == SDLK_MINUS || key.keysym.sym == SDLK_KP_MINUS) ? -1 : +1;
            if (0 <= factor && factor <= 3) {
                  newMode = s_gfxModeSwitchTable[_scalerType][factor];
            }
      }

      const bool isNormalNumber = (SDLK_1 <= key.keysym.sym && key.keysym.sym <= SDLK_9);
      const bool isKeypadNumber = (SDLK_KP1 <= key.keysym.sym && key.keysym.sym <= SDLK_KP9);
      if (isNormalNumber || isKeypadNumber) {
            _scalerType = key.keysym.sym - (isNormalNumber ? SDLK_1 : SDLK_KP1);
            if (_scalerType >= ARRAYSIZE(s_gfxModeSwitchTable))
                  return;

            while (s_gfxModeSwitchTable[_scalerType][factor] < 0) {
                  assert(factor > 0);
                  factor--;
            }
            newMode = s_gfxModeSwitchTable[_scalerType][factor];
      }

      if (newMode >= 0) {
            setGraphicsMode(newMode);
#ifdef USE_OSD
            if (_osdSurface) {
                  const char *newScalerName = 0;
                  const GraphicsMode *g = getSupportedGraphicsModes();
                  while (g->name) {
                        if (g->id == _mode) {
                              newScalerName = g->description;
                              break;
                        }
                        g++;
                  }
                  if (newScalerName) {
                        char buffer[128];
                        sprintf(buffer, "Active graphics filter: %s\n%d x %d -> %d x %d",
                              newScalerName,
                              _screenWidth, _screenHeight,
                              _hwscreen->w, _hwscreen->h
                              );
                        displayMessageOnOSD(buffer);
                  }
            }
#endif

      }

}

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